Biconcave
a. 双凹的\\n[医] 双凹[形]的
🏥 医学释义
双凹面的，双凹（形）的
🗣️ 情景例句
And Dad saved his life.
爸爸救了他的命。
better early than late.
宁早勿迟。
I have quite a lot of homework to do.
我有很多家庭作业要做。